There are few times one will see more than one electric airplane at the same place – outside of perhaps, Friedrichshafen’s e-Flight Expo every year. But to see them flying at the same field on the same day is an even grander delight. That happened September 9 and 10 at Grenchen, Switzerland. Grenchen hosted the world’s first all-electric fly-in – the SmartFlyer Challenge. It drew an appreciable number of electric aircraft of all sizes and types despite the clouds and rain that kept some from scaling the mountains. An Electric Three-Plane Formation Flight The Siemens-powered Magnus e-Fusion from the Czech Republic, the electric Phoenix motorglider, and Stuttgart University’s e-Genius all flew formation with a Piper L-4, a World War Two …